import fetch from 'dva/fetch';
import {message} from 'antd';
import {routerRedux} from 'dva/router';
import store from '../index';
import config from "../utils/config";
import {stringify} from 'qs';

const codeMessage = {
  200: '服务器成功返回请求的数据。',
  201: '新建或修改数据成功。',
  202: '一个请求已经进入后台排队（异步任务）。',
  204: '删除数据成功。',
  400: '发出的请求有错误，服务器没有进行新建或修改数据的操作。',
  401: '用户没有权限（令牌、用户名、密码错误）。',
  403: '用户得到授权，但是访问是被禁止的。',
  404: '发出的请求针对的是不存在的记录，服务器没有进行操作。',
  406: '请求的格式不可得。',
  410: '请求的资源被永久删除，且不会再得到的。',
  422: '当创建一个对象时，发生一个验证错误。',
  500: '服务器发生错误，请检查服务器。',
  502: '网关错误。',
  503: '服务不可用，服务器暂时过载或维护。',
  504: '网关超时。',
  TypeError: '网络错误，请检查接口网络是否正常。',
};
function checkStatus(response) {
  if (response.status >= 200 && response.status < 300) {
    return response;
  }
  const errortext = codeMessage[response.status] || response.statusText;
  if (response.status !== 400 && response.status !== 401 && response.status !== 500) {
    message.destroy();
    message.error(`请求错误 ${response.status}: ${errortext}`);
    console.error({
      message: `请求错误 ${response.status}: ${response.url}`,
      description: errortext,
    })
  }
  const error = new Error(errortext);
  error.name = response.status;
  error.response = response;
  throw error;
}

/**
 * Requests a URL, returning a promise.
 *
 * @param  {string} urlPrefix       The URL we want to request
 * @param  {object} [options] The options we want to pass to "fetch"
 * @return {object}           An object containing either "data" or "err"
 */
export default function request(urlPrefix, options) {
  const defaultOptions = {
    // credentials: 'include',
    mode: 'cors',
  };
  const newOptions = { ...defaultOptions, ...options };
  if (newOptions.method === 'POST' || newOptions.method === 'PUT') {
    if (!(newOptions.body instanceof FormData)) {
      newOptions.headers = {
        Accept: 'application/json',
        'Content-Type': 'application/json; charset=utf-8',
        ...newOptions.headers,
      };
      newOptions.body = JSON.stringify(newOptions.body);
    } else {
      // newOptions.body is FormData
      newOptions.headers = {
        Accept: 'application/json',
        ...newOptions.headers,
      };
    }
  }

  let url = urlPrefix;
  if(url) {
    url = config.baseURL + url;
    // if(newOptions.method === 'GET') {
    //   url = `${url}?${stringify(newOptions.body)}`;
    // }
  }

  const authorization = localStorage.getItem('Authorization');
  if(authorization) {
    const tokenObj = JSON.parse(authorization);
    newOptions.headers = {
      'Authorization': `${tokenObj.token_type} ${tokenObj.access_token}`,
      ...newOptions.headers,
    };
  }

  return fetch(url, newOptions)
    .then(checkStatus)
    .then(response => {
      return response.json();
    })
    .catch(e => {
      const { dispatch } = store;
      const status = e.name;
      if(status === 'TypeError') {
        message.destroy();
        message.error(codeMessage[status]);
      }
      if (status === 401) {
        dispatch({
          type: 'sysLogin/logout',
        });
      }
      if (status === 403) {
        dispatch(routerRedux.push('/exception/403'));
        return;
      }
      if (status <= 504 && status >= 500) {
        dispatch(routerRedux.push('/exception/500'));
        return;
      }
      if (status >= 404 && status < 422) {
        dispatch(routerRedux.push('/exception/404'));
      }
      return {ok: false, message: codeMessage[status]};
    });
}
